THE GENERAL PURPOSE OF THIS FM RADIO TRANSPOSER ETR SERIES, IS REBROADCAST THE SIGNALS IN THE SAME FM BAND GRANTING AN EFFECTIVE COVERAGE FOR ALL THOSE AREAS WHERE RF SIGNAL IS TOO WEAK. THIS EQUIPMENT CAN BE PROVIDES AT THREE OUTPUT POWER FIGURES AND BROADCAST QUALITY. A COMPLETE ELECTRICAL SHIELD SEPARATES THE TRANSMITTING AND RECEIVING SECTIONS, THUS AVOIDING UNDESIRED MUTUAL INTERACTIONS. ALL THE CIRCUITRIES HAVE BEEN DESIGNED ACCORDING TO “MODULARITY CONCEPT”, TO GRANT EASY AND QUICK MAINTENANCE. THIS CONCEPT ALSO ALLOWS USING THE EQUIPMENT AS SINGLE RECEIVER OR SINGLE TRANSMITTER, SINCE THE CONNECTION BETWEEN THESE TWO SECTIONS IS EXTERNALLY PLACED AND ACCESSIBLE BY BNC CONNECTORS. BOTH SECTIONS CAN BE REMOTELY CONTROLLED VIA RS232 PORT. IN THE DESIGN OF THE TRC SERIES TRANSPOSERS, A SPECIAL ATTENTION HAS BEEN DEVOTED TO THE CONSUMPTION ASPECT: AC-DC SWTICHMODE POWER SUPPLIES HAVE BEEN THEREFORE IMPLEMENTED, WITH PFC (POWER FACTOR CONNECTOR) TO DRASTICALLY REDUCE THE ABSORPTION OF REACTIVE POWER.

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Wheel bearings allow cars and trucks to run smoother and more efficiently by reducing friction and supporting vehicle weight.

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Under normal driving conditions, wheel bearings should last 85,000 to 100,000 miles. They can fail for several reasons, including:

I’ve replaced hundreds, if not thousands, of wheel bearings. One thing I’ve learned: A bad wheel bearing always gives an indication it’s failing. These include:

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The cage and rollers are held together inside a hardened metal ring called a “race.” The seal keeps grease in and damaging water and debris out. Wheel bearings are installed inside, and secured to, the suspension, either by press-fit, bolts or a snap-ring. Once mounted, the wheel bearing rides on the axle shaft, allowing the tire/wheel to spin effortlessly.

Driving on a bad or failing wheel bearing is dangerous. If ignored, it can quickly turn into a safety issue and an expensive repair.

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However, on some vehicles, it can be less than $100 per wheel. And you can save hundreds in labor if you DIY. If you don’t have the tools, most auto parts stores will lend you the specialty tools and equipment needed.

Never reuse any wheel bearing (sealed or tapered) that’s loose, worn, noisy or shows any signs of wear. Trying to fix a loose or damaged wheel bearing can result in an accident and severe injury. Even if a pro suggests repairing a bearing, don’t let them.

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The average cost to replace a sealed wheel hub bearing is around $350 per wheel. However, depending on the make and model, the shop labor rate ($47 to $215 per hour, according to AAA) and any additional damage could push the cost beyond $1,000 per wheel.

Older rear-wheel-drive cars or trailers use a set of two tapered roller bearings that face each other. These should be routinely serviced every 20,000 miles, or once a year.

In my 50 years in the auto repair industry, I can’t recall one good story about wheel bearings. Most involve some sort of brake system failure, tires exploding, or fire from a seized red-hot bearing igniting axle grease. Bad wheel bearings should not be ignored.

On modern front- and four-wheel-drive cars, wheel bearings are a set of permanently sealed, precisely machined steel ball or straight roller bearings. The balls or rollers are encased in a “cage” that supports the bearings, allowing them to rotate freely.

NOTE: Whether you DIY or your mechanic replaces the bearing, always install a new axle hub nut. Most hub nuts are prevailing torque fasteners. They’re used on critical components, like securing axle shafts to hub bearings, where a loose nut could lead to disastrous consequences.

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My opinion? If your vehicle has more than 50,000 miles or has been driven in harsh conditions, then it’s logical to replacing wheel bearings on both axles. However, if your vehicle has low mileage and the other bearing is in good condition, replacing only the damaged bearing should not be a problem.